Sub-threshold MOSFET Operation - MIT OpenCourseWare
MOSFETs operating in strong inversion when we bias as close to threshold as possible. This current limits how close we can get. 2. It is a major source of power dissipation and heating in modern VLSI digital ICs. When you have millions of MOSFETs on an IC chip, even a little bit of current through the half that are supposed to be "off" can add up
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